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Easy factoring question

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by scoobydooby » Wed Apr 22, 2009 9:56 am
x^4 - 10x^2 + 9
=> x^4-9x^2-x^2+9
=>x^2(x^2-9)-1(x^2-9)
=>(x^2-9)(x^2-1)
=>(x+3)(x-3)(x+1)(x-1)
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by lilu » Wed Apr 22, 2009 10:00 am
You can factor it into (x^2 - 9) ( x^2 -1).
Then-->
(x -3)(x+3)(x-1)(x+1)
The more you look, the more you see.
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by kevind147 » Wed Apr 22, 2009 10:11 am
good lord, that was fast. i told you it was easy! thanks guys! i need to learn to look at this stuff from different angles ...
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